Cleaning composition



' Part Patented Oct. 1, 1935 UNITED STATES PATENT OFFICE 2,016,265 g 1 Y omsnmo comrosmon erty, Houston, 'l'ex., assignor to Standard Oil Development Company, a corpo- No Drawing. Application Serial No.

SCIalms.

This invention relates to improvements in cleaning compositions, especially adapted for cleaning oily surfaces. In its preferred form the invention comprises partly purified by separately removing the oil and sulphuric acid. I

The sludge is first washed with a medium heavy petroleum distillate and after agitation and stratification, the oil layer is drawn of! carrying with it a considerable portion of the oil. The remaining sludge is diluted with water sufilcient to form two layers. after agitation with steam. The mixtime after being thoroughly agitated with steam is allowed to settle and the water layer containing the major portion of the sulphuric acid present in the sludge is removed. The residual sludge layer is extracted with naphtha for removal of the remaining fraction of oil.

The separate sludge layer containing sludge I Per cent ly purified sludge '(20 to 35% sludge acids) Sodium hydroxide 15 to 17 Sodium carbonate 13 to 15 The amount of alkali is suilicient to neutralize all ormost oi the sludge acids. They should be always neutralized to a substantial extent but some free acidity is not objectionable.

This composition is dissolved in hot or cold water in the proportions 01' 10 ounces, or about pint toa gallon oi water may be used as folows:

. For cleaning surfaces; by wetting the surface to be cleaned with the prepared solution, allowing to stand or soak for about ten minutes, then scrubbing or rubbing with a brush and rinsing oi! heating the preoily rags in the hours, then rinsing out,

April 9, 1932, 604,351

For removing paint;' by preparing a 25 to water solution of the composition and jetting with steam onto paint to be removed and rinsing oil with clean water.

For opening drain of the composition is dissolved in one gallon oi water, heated and poured into. the drain pipe.

For .reclamation work; use steel vats large enough to receive the material to be cleaned.

pipes and traps; 15 ounces The steel vats'should be so constructed that heat 10 may be applied. The temperature of. 180 to 20.0 F. gives the best results. A pulley may be placed above the vat to raise and lower the equipment to be cleaned. Allow the equipment to, remain in the hot solution approximately two hours. Remove and rinse with clear water. This will put the equipment in shape to be easily worked over. 7

Alternate forms of cleaning compositions are prepared in which purified acid sludges neutral- 2o ized with sodium. or potassium hydroxide and having sodium or potassium hydroxide in excess up to 10%, are used as bases according to the following:

'lrlsodium Total Bases Pine oil phosphate Water volume Pounds Gallons Pound: Gallon: Gallon:

The compositions are suitable for cleaning surfaces. Paints are readily removed when the compositions are suitably applied, as with a jet of steam. Greases are readily removed. The compositions are especially adapted for cleaning garage floors and driveways, especially where it is desired to remove oil from concrete, or composition floors, etc.

The foregoing description is merely illustrative and various changes and alternative arrangements may be made within the scope of the appended claims in which it is my intention to claim all novelty inherent in the lnventionas broadly as the prior art permits.

I claim:

1. A method oi preparing a cleaning composition which comprises a sludge separated from 50 concentrated sulfuric acid treatment of petroleum oils and purifledby separately treating the sludge with petroleum distillates to substantially remove oil, by separately treating the residual sludge with water phosphate and water.

2. Amethod of preparing a cleaning composition, which oomprises treating petroleum oils with concentrated sulfuric acid, separating the sludge la'yer, treating the sludge layer with medium heavy oil distillate and removing the oil naphtha and removing layer, treating the residual sludge layer with water and steam and removingthe acid water layer, treating the residual sludge layer with the naphtha layer and adding to 50% of the partly purified sludgel15 to 17% of an alkali metal hydroxide and 13 to 15% of an alkali metal carbonate. 3. Method according to claim 2 alkali metal hydroxide is sodium hydroxide and the alkali metal carbonate is sodium carbonate: m

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